[1] The skeleton of the batch heater, ready for reflectors. [2] The two center pieces of insulation must be beveled to fit snuggly at the cusp. [3] All insulation should be carefully taped to prevent air leaks. [4] The tank rests on supports cut into the three 3/4"" plywood ribs and stand formed from ""two-by"" lumber. [5] The completed collector resides behind the greenhouse's glazing. [6] Our smaller solar chimney. [7] The central sun-powered ventilator exhausts air from the roof peak.